Hire the Best Android Developers
in Brazil

I build production-minded automation, mobile apps, APIs, and AI-assisted workflows that need to work reliably outside a demo. My strongest fit is where mobile, Python automation, data capture, and integrations meet: - Python automation: Playwright/Selenium workflows, API integrations, Google Sheets/Excel outputs, scheduled pipelines, data normalization, retries, logging, and handoff documentation. - Mobile/Flutter: 7+ years in mobile, including Flutter/Dart, Android/Kotlin, iOS/Swift, Firebase, offline-first data, API integrations, dynamic forms, image/document capture, push notifications, and release/debug workflows. - AI agents and LLM tooling: practical experience with local automation, agent-style workflows, MCP-style tool integration, structured actions, human approval loops, and debugging tool-calling behavior. - Backend/API work: Django, Google Cloud Functions, REST/GraphQL integrations, Docker environments, BFF patterns, caching, and production troubleshooting. Relevant examples: - Built Python Google Cloud Functions for support/newsletter workflows and Facebook API data caching for a Flutter/Kotlin app. - Built a Django/React allocation system using OR-Tools and automated Google Sheets workflows. - Modernized Flutter apps with dynamic forms, validation, image upload, API compatibility updates, Firebase, and BLoC. - Delivered offline-first Android/Flutter field apps with maps, local databases, sync, scanners, camera/device integrations, and production stability work. - Debugged and improved mobile performance, including large map rendering and app loading/stability issues. I work best on small, urgent, concrete problems: a scraper that must produce clean Excel output, a Flutter/API bug that blocks users, an automation that needs retries/logs, or an agent/local-LLM workflow that is stuck in a loop. I will tell you where the risk is, keep the scope clear, and leave code/documentation that someone else can maintain.

I am a Full Stack Developer with experience building web applications, Android applications, automation tools, and data-driven systems. I have worked on real-world projects for organizations such as Motorola (through Instituto Eldorado) and the Brazilian Federal Court of Accounts (TCU), developing software used in corporate and research environments. My main areas of expertise are: • Full Stack Development - JavaScript/TypeScript, React, Node.js/Express, REST APIs, SQL databases • Android Development - Kotlin, Java, Android SDK, Jetpack, AOSP, native applications • Python Development - automation scripts, web scraping, data processing, APIs, and machine learning workflows • Data Analysis - Pandas, NumPy, OpenCV, OCR, and data pipelines • Embedded/IoT Systems - ESP32, MQTT, Raspberry Pi, Docker-based deployments • Game Development - Unity, Godot and C++ engines • 3D Modelling - Blender, Maya Some examples of my previous work: • Developed web applications using Express.js and Python for data analysis and fraud detection support at TCU • Built automation tools using Python and web scraping to collect and process internal data • Developed Android features for Motorola products, including Smart Connect functionality and camera/device integrations • Worked with Android Open Source Project (AOSP) layers and embedded Android development • Created IoT solutions using ESP32 sensors, MQTT communication, and web dashboards I focus on delivering clean, maintainable solutions with attention to performance, reliability, and user experience. I am comfortable working independently, communicating with international teams, and quickly learning new technologies to solve complex problems.

I am a Mobile and Full-Stack Developer with experience delivering scalable solutions across banking, retail, logistics, AI, and enterprise applications. My background includes Android (Kotlin), Flutter, Firebase, REST APIs, cloud services, and technical leadership. Throughout my career, I have contributed to projects ranging from financial platforms and business applications to AI-powered systems and mobile products used by thousands of users. Some projects I have worked on include: • Santander Empresas – Mobile Banking Platform • TradeForce – Field Operations & Logistics Solution • Reuzee – Mobile Application Development • KaiCrest – AI-Powered Training and Knowledge Platform • AI Image Classification and Training Systems I focus on understanding business requirements, delivering high-quality solutions, maintaining clear communication, and ensuring projects are completed efficiently and reliably. My goal is not only to develop software but to create products that generate real value for users and businesses.

Hi, I'm David. I'm a Software Development student based in Brazil, focused on building modern applications, games, and systems with clean architecture and real-world performance in mind. I combine a developer's mindset with a strong focus on user experience, problem-solving, and practical results. Whether it's coding an application, testing a system, or improving a product, I approach everything thinking like both a developer and an end user. If you need someone who understands not just how to build things, but how they should behave in real scenarios, you're in the right place. Here’s what I bring to your project: Software & Application Development I build applications using modern technologies with a focus on performance, clean code, and scalability. I have experience with mobile and web development, working with tools like Kotlin, Android Studio, and modern development frameworks. Game Development & Systems Design I work with game development (Unity and similar tools), creating systems like inventory, mechanics, and gameplay features. I focus on building structured and scalable systems, not just visuals. Technical QA & Problem Solving I analyze systems to find bugs, inconsistencies, and performance issues. More than just identifying problems, I provide clear explanations and practical solutions that developers can actually implement. My Background: Education: Software Development Student (Brazil) Languages: Native Brazilian Portuguese | Basic English Tools: Git, Android Studio, Unity, VS Code I'm focused on growth, discipline, and delivering real value through my work. Send me a message with a quick overview of your project, and let’s build something solid.

12+ years building software for JPMorgan Chase, Cisco, Avaya, and Ford. 12,400+ hours on Upwork alone. AI-augmented engineer running parallel agents with Claude Code and Codex. Production-grade output at a pace that would normally require a team. Built ML-powered palm biometrics kiosk apps for Keyo (Series A, $30M+ raised, thousands of devices deployed, backed by Netflix co-founder), deployed at JPMorgan Chase. Shipped AI-driven identity verification SDKs at Journey.ai (Gartner Cool Vendor, Zero Knowledge Network, multi-modal biometrics with 99.9999% accuracy) used by Cisco Webex and Avaya, and on prototypes for unreleased Ford partnerships. Worked on an AI teaching assistant active in 125+ UK classrooms, 40,000+ questions answered by AI. Led the development of the POV Disposable Camera Android app (3M+ users, 4.9 stars). AI feature integration (OpenAI, Anthropic, Azure), web applications (Next.js, TypeScript), full-stack products with Firebase, Supabase, and Cloud Functions, Kotlin Multiplatform apps, app refactoring and modernization, native Android and AndroidTV apps (Kotlin, Jetpack Compose), IoT and kiosk applications, and video streaming solutions (ExoPlayer, HLS). Software engineer building mobile apps, web apps, and backend systems. Engineering Manager and CTO experience. Delivering multiple times faster than traditional development without sacrificing code quality or architecture. "Excellent development manager. Writes clean code, good eye for design, successfully managing a team of mobile developers. A core manager in our organisation." - Chris Cooper, CEO at NeoMatrix "Takes initiative and drives the product forward, not only through technical skills but understanding the what and the why of what we're building." - Todd Zusman, Director of Engineering at Journey.ai "Strong technical skills, excellent communication, a true team player and great manager. Architect of a complex cross-platform project. We'd happily work with him again." - Cayetana Polanco, CPO at Keyo "A rare find and very dedicated engineer, team lead and manager. Thiago always delivers." - Al Calendario, Director of Integration at Keyo "Accomplished all tasks very well, sometimes beyond expectations. In command of the Android API, managed tasks with little supervision, keen interest in the business purposes of the app." - Stephen Hosking, CEO at NoPowerTXT "Communication is impeccable, incredibly reliable, very detail-oriented. The kind of leader who grows through adversity and never loses sight of the people." - Lynda Yang, SHRM-SCP at Untitled Shows Kotlin, Java, TypeScript, Python Jetpack Compose, MVVM/MVI, Hilt, Room, Retrofit, Coroutines, ExoPlayer Kotlin Multiplatform Firebase (Firestore, Cloud Functions, RTDB), Node.js, Next.js Claude Code, Codex, OpenAI API, Anthropic API, Azure AI GitHub Actions CI/CD, automated code review, multi-worktree workflows PostHog, Crashlytics, Sentry Check the portfolio below and send a message. Happy to discuss your project.

Analytical and detail-oriented Senior Developer with 4+ years of expertise in building high-performance, production-ready mobile ecosystems. Native & Cross-Platform Mastery: Expert in Kotlin (Jetpack Compose, Coroutines) and Flutter (State Management, Flame Engine) to deliver 60fps user experiences. Scalable Architecture: Specialized in clean SDK design, full activity lifecycle management, and robust backend integration using Firebase and Supabase. Modern Tech Stack: Proficient in Retrofit2, RxJava, and Room DB, with a focus on writing clean, maintainable code and concise technical documentation. Client-Centric Solutions: Dedicated to transforming complex business requirements into intuitive mobile products through strategic version control (GIT) and agile collaboration.